package com.hoopchina.ui.main;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.List;
import com.hoopchina.news.R;
import com.hoopchina.meta.NewsItem;
import android.content.Context;
import android.content.SharedPreferences;
import android.preference.PreferenceManager;
import android.util.AttributeSet;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.LinearInterpolator;
import android.view.animation.RotateAnimation;
import android.widget.AbsListView;
import android.widget.AdapterView;
import android.widget.ImageView;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.AbsListView.OnScrollListener;

/**
 * NewsListView
 * 新闻列表
 * 
 * @author Neusoft
 */
public class NewsListView extends ListView implements OnScrollListener{
    private Context mContext ;
    private INewsListViewObserver mObserver;
    private NewsListAdapter     mAdapter;
	private boolean isHaveHeader;
	Boolean isAutoLoading;
	Boolean isNewsList = true;
	
	private static final int TAP_TO_REFRESH = 1;
    private static final int PULL_TO_REFRESH = 2;
    private static final int RELEASE_TO_REFRESH = 3;
    private static final int REFRESHING = 4;

    private static final String TAG = "PullToRefreshListView";

    private OnRefreshListener mOnRefreshListener;

    /**
     * Listener that will receive notifications every time the list scrolls.
     */
    private OnScrollListener mOnScrollListener;
    private LayoutInflater mInflater;

    private RelativeLayout mRefreshView;
    private TextView mRefreshViewText;
    private ImageView mRefreshViewImage;
    private ProgressBar mRefreshViewProgress;
    private TextView mRefreshViewLastUpdated;

    private int mCurrentScrollState;
    private int mRefreshState;

    private RotateAnimation mFlipAnimation;
    private RotateAnimation mReverseFlipAnimation;

    private int mRefreshViewHeight;
    private int mRefreshOriginalTopPadding;
    private int mLastMotionY;
    
    /*
     * 设置新闻列表的监听器
     */
    public void setObserver( INewsListViewObserver observer ) {
        mObserver = observer;
    }
    
    public INewsListViewObserver getObserver() {
        return mObserver;
    }
    
    
    /**
     * 构造器
     */
    public NewsListView( Context context ) {
        super( context );
        init( context );
    }

    /**
     * 构造器
     */
    public NewsListView( Context context, AttributeSet attrs ) {
        super( context, attrs );
        init( context );
    }

    /**
     * 构造器
     */
    public NewsListView( Context context, AttributeSet attrs, int defStyle ) {
        super( context, attrs, defStyle );
        init( context );
    }
    
    /*
     * 初始化列表的数据
     */
    private void init( Context context ){
        
     // Load all of the animations we need in code rather than through XML
        mFlipAnimation = new RotateAnimation(0, -180,
                RotateAnimation.RELATIVE_TO_SELF, 0.5f,
                RotateAnimation.RELATIVE_TO_SELF, 0.5f);
        mFlipAnimation.setInterpolator(new LinearInterpolator());
        mFlipAnimation.setDuration(250);
        mFlipAnimation.setFillAfter(true);
        mReverseFlipAnimation = new RotateAnimation(-180, 0,
                RotateAnimation.RELATIVE_TO_SELF, 0.5f,
                RotateAnimation.RELATIVE_TO_SELF, 0.5f);
        mReverseFlipAnimation.setInterpolator(new LinearInterpolator());
        mReverseFlipAnimation.setDuration(250);
        mReverseFlipAnimation.setFillAfter(true);

        mInflater = (LayoutInflater) context.getSystemService(
                Context.LAYOUT_INFLATER_SERVICE);

        mRefreshView = (RelativeLayout) mInflater.inflate(
                R.layout.pull_to_refresh_header, this, false);
        mRefreshViewText =
            (TextView) mRefreshView.findViewById(R.id.pull_to_refresh_text);
        mRefreshViewImage =
            (ImageView) mRefreshView.findViewById(R.id.pull_to_refresh_image);
        mRefreshViewProgress =
            (ProgressBar) mRefreshView.findViewById(R.id.pull_to_refresh_progress);
        mRefreshViewLastUpdated =
            (TextView) mRefreshView.findViewById(R.id.pull_to_refresh_updated_at);

        mRefreshViewImage.setMinimumHeight(50);
        mRefreshView.setOnClickListener(new OnClickRefreshListener());
        mRefreshOriginalTopPadding = mRefreshView.getPaddingTop();

        mRefreshState = TAP_TO_REFRESH;

        addHeaderView(mRefreshView);

        super.setOnScrollListener(this);

        measureView(mRefreshView);
        mRefreshViewHeight = mRefreshView.getMeasuredHeight();
        
        mContext = context;
    	isHaveHeader = false;

        setOnItemClickListener( new OnItemClickListener() {
            @Override
            public void onItemClick( AdapterView<?> parent, View view, int position, long id ) {
             
               if(null != mObserver) {
            	   if( isHaveHeader && 0 == position ) {
                       mObserver.onNewsListHeaderClick( parent, view, position, id );
                   }
            	   else {
            		   mObserver.onNewsListItemClick( parent, view, position, id );
            	   }
               }
            }
        });
        
        setOnItemLongClickListener( new OnItemLongClickListener() {
            @Override
            public boolean onItemLongClick( AdapterView<?> parent, View view, int position, long id ) {
                if(null != mObserver) {
                    mObserver.onNewsListItemLongClick( parent, view, position, id );
                }
                return false;
            }
        });
        
     //refreshScrollListener();
    }

	public void refreshScrollListener() {
		// 监听listview滚到最底部
		    setOnScrollListener(new OnScrollListener(){
		      @Override
		      public void onScrollStateChanged(AbsListView view,int scrollState){

		    //设置是否 “加载更多”项显示
		    SharedPreferences appSettings = PreferenceManager.getDefaultSharedPreferences(mContext);
		    Boolean isAutoLoading = appSettings.getBoolean("settings_auto_loadmore", false);//.getString("settings_auto_loadmore", null);
		    if ( isAutoLoading && isNewsList )
		    {
		    	mAdapter.displayLoadMoreButton(false);
		    }
		    else
		    {
		    	mAdapter.displayLoadMoreButton(true);
		    }
		    	  
		      switch (scrollState){
		      // 当不滚动时
		      case OnScrollListener.SCROLL_STATE_IDLE:
		     // 判断滚动到底部
		     if (view.getLastVisiblePosition() == (view.getCount() - 1)){
		    	 if ( isAutoLoading ){
		    		mAdapter.displayLoadMoreButton(true);
		        	mObserver.autoLoadMoreList();
		        	//Toast.makeText(mContext, "正在加载更多新闻", 2000).show();
		    	 }
		    	 else{
		    		 mAdapter.displayLoadMoreButton(false);
		    	 }

		       }
		       break;
		      }
		      }
		
		      @Override
		      public void onScroll(AbsListView view,int firstVisibleItem,
		      int visibleItemCount,int totalItemCount){
		      }

		    });
		    
		    setFastScrollEnabled(true);
	}
    /*
     * 为列表设置数据
     */
    public void setDataList( List<NewsItem> listData ,boolean isNewsList){
    	//setSelector(R.d)
        mAdapter = new NewsListAdapter( mContext, listData, mObserver , isNewsList );
        setAdapter( mAdapter );
        notifyDataSetChanged();
        refreshScrollListener();
//        //设置是否 “加载更多”项显示
//        SharedPreferences appSettings = PreferenceManager.getDefaultSharedPreferences(mContext);
//        Boolean isAutoLoading = appSettings.getBoolean("settings_auto_loadmore", false);//.getString("settings_auto_loadmore", null);
//        if ( isAutoLoading )
//        {
//        	mAdapter.displayLoadMoreButton(true);
//        }
//        else
//        {
//        	mAdapter.displayLoadMoreButton(false);
//        }
    }

    public void notifyDataSetChanged() {
        if ( null != mAdapter  ) {
            mAdapter.notifyDataSetChanged();
        }
    }
    
    public void nextPage() {
        
    }
    
    
    public void addHeaderView( View v ) {
    	isHaveHeader = true;
    	super.addHeaderView( v );
    }
    /*
     * 设置刷新按钮上进度条显隐
     */
	public void setLoadMoreProgressBarVisibility(int v) {
		mAdapter.setLoadMoreProgressBarVisibility(v);
	}
	
	/*
	 * 设置加载更多按钮文字
	 */
    public  void setLoadMoreButtonText(int aText){
    	mAdapter.setLoadMoreButtonText(aText);
    }
    public void displayLoadMoreButton( boolean isDisp ) {
    	mAdapter.displayLoadMoreButton(isDisp);
    }
    
    /*
	 * 设置加载更多按钮是否可用
	 */
    public  void setLoadMoreButtonEnable(boolean isEnable){
    	mAdapter.setLoadMoreButtonEnable(isEnable);
    }
    
    public   void setLoadMoreButtonVisibility(int isVisiblble){
    	mAdapter.setLoadMoreButtonVisibility(isVisiblble);
    }
    
    @Override
    protected void onAttachedToWindow() {
        setSelection(1);
    }

    @Override
    public void setAdapter(ListAdapter adapter) {
        super.setAdapter(adapter);

        setSelection(1);
    }

    /**
     * Set the listener that will receive notifications every time the list
     * scrolls.
     * 
     * @param l The scroll listener. 
     */
    @Override
    public void setOnScrollListener(AbsListView.OnScrollListener l) {
        mOnScrollListener = l;
    }

    /**
     * Register a callback to be invoked when this list should be refreshed.
     * 
     * @param onRefreshListener The callback to run.
     */
    public void setOnRefreshListener(OnRefreshListener onRefreshListener) {
        mOnRefreshListener = onRefreshListener;
    }

    /**
     * Set a text to represent when the list was last updated. 
     * @param lastUpdated Last updated at.
     */
    public void setLastUpdated(CharSequence lastUpdated) {
        if (lastUpdated != null) {
            mRefreshViewLastUpdated.setVisibility(View.VISIBLE);
            mRefreshViewLastUpdated.setText(lastUpdated);
        } else {
            mRefreshViewLastUpdated.setVisibility(View.GONE);
        }
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        final int y = (int) event.getY();

        switch (event.getAction()) {
            case MotionEvent.ACTION_UP:
                if (!isVerticalScrollBarEnabled()) {
                    setVerticalScrollBarEnabled(true);
                }
                if (getFirstVisiblePosition() == 0 && mRefreshState != REFRESHING) {
                    if ((mRefreshView.getBottom() > mRefreshViewHeight
                            || mRefreshView.getTop() >= 0)
                            && mRefreshState == RELEASE_TO_REFRESH) {
                        // Initiate the refresh
                        mRefreshState = REFRESHING;
                        prepareForRefresh();
                        onRefresh();
                    } else if (mRefreshView.getBottom() < mRefreshViewHeight
                            || mRefreshView.getTop() < 0) {
                        // Abort refresh and scroll down below the refresh view
                        resetHeader();
                        setSelection(1);
                    }
                }
                break;
            case MotionEvent.ACTION_DOWN:
                mLastMotionY = y;
                break;
            case MotionEvent.ACTION_MOVE:
                applyHeaderPadding(event);
                break;
        }
        return super.onTouchEvent(event);
    }

    private void applyHeaderPadding(MotionEvent ev) {
        final int historySize = ev.getHistorySize();

        // Workaround for getPointerCount() which is unavailable in 1.5
        // (it's always 1 in 1.5)
        int pointerCount = 1;
        try {
            Method method = MotionEvent.class.getMethod("getPointerCount");
            pointerCount = (Integer)method.invoke(ev);
        } catch (NoSuchMethodException e) {
            pointerCount = 1;
        } catch (IllegalArgumentException e) {
            throw e;
        } catch (IllegalAccessException e) {
            System.err.println("unexpected " + e);
        } catch (InvocationTargetException e) {
            System.err.println("unexpected " + e);
        }

        for (int h = 0; h < historySize; h++) {
            for (int p = 0; p < pointerCount; p++) {
                if (mRefreshState == RELEASE_TO_REFRESH) {
                    if (isVerticalFadingEdgeEnabled()) {
                        setVerticalScrollBarEnabled(false);
                    }

                    int historicalY = 0;
                    try {
                        // For Android > 2.0
                        Method method = MotionEvent.class.getMethod(
                                "getHistoricalY", Integer.TYPE, Integer.TYPE);
                        historicalY = ((Float) method.invoke(ev, p, h)).intValue();
                    } catch (NoSuchMethodException e) {
                        // For Android < 2.0
                        historicalY = (int) (ev.getHistoricalY(h));
                    } catch (IllegalArgumentException e) {
                        throw e;
                    } catch (IllegalAccessException e) {
                        System.err.println("unexpected " + e);
                    } catch (InvocationTargetException e) {
                        System.err.println("unexpected " + e);
                    }

                    // Calculate the padding to apply, we divide by 1.7 to
                    // simulate a more resistant effect during pull.
                    int topPadding = (int) (((historicalY - mLastMotionY)
                            - mRefreshViewHeight) / 1.7);

                    mRefreshView.setPadding(
                            mRefreshView.getPaddingLeft(),
                            topPadding,
                            mRefreshView.getPaddingRight(),
                            mRefreshView.getPaddingBottom());
                }
            }
        }
    }

    /**
     * Sets the header padding back to original size.
     */
    private void resetHeaderPadding() {
        mRefreshView.setPadding(
                mRefreshView.getPaddingLeft(),
                mRefreshOriginalTopPadding,
                mRefreshView.getPaddingRight(),
                mRefreshView.getPaddingBottom());
    }

    /**
     * Resets the header to the original state.
     */
    private void resetHeader() {
        if (mRefreshState != TAP_TO_REFRESH) {
            mRefreshState = TAP_TO_REFRESH;

            resetHeaderPadding();

            // Set refresh view text to the pull label
            mRefreshViewText.setText(R.string.pull_to_refresh_tap_label);
            // Replace refresh drawable with arrow drawable
            mRefreshViewImage.setImageResource(R.drawable.ic_pulltorefresh_arrow);
            // Clear the full rotation animation
            mRefreshViewImage.clearAnimation();
            // Hide progress bar and arrow.
            mRefreshViewImage.setVisibility(View.GONE);
            mRefreshViewProgress.setVisibility(View.GONE);
        }
    }

    private void measureView(View child) {
        ViewGroup.LayoutParams p = child.getLayoutParams();
        if (p == null) {
            p = new ViewGroup.LayoutParams(
                    ViewGroup.LayoutParams.FILL_PARENT,
                    ViewGroup.LayoutParams.WRAP_CONTENT);
        }

        int childWidthSpec = ViewGroup.getChildMeasureSpec(0,
                0 + 0, p.width);
        int lpHeight = p.height;
        int childHeightSpec;
        if (lpHeight > 0) {
            childHeightSpec = MeasureSpec.makeMeasureSpec(lpHeight, MeasureSpec.EXACTLY);
        } else {
            childHeightSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
        }
        child.measure(childWidthSpec, childHeightSpec);
    }

    @Override
    public void onScroll(AbsListView view, int firstVisibleItem,
            int visibleItemCount, int totalItemCount) {
        // When the refresh view is completely visible, change the text to say
        // "Release to refresh..." and flip the arrow drawable.
        if (mCurrentScrollState == SCROLL_STATE_TOUCH_SCROLL
                && mRefreshState != REFRESHING) {
            if (firstVisibleItem == 0) {
                mRefreshViewImage.setVisibility(View.VISIBLE);
                if ((mRefreshView.getBottom() > mRefreshViewHeight + 20
                        || mRefreshView.getTop() >= 0)
                        && mRefreshState != RELEASE_TO_REFRESH) {
                    mRefreshViewText.setText(R.string.pull_to_refresh_release_label);
                    mRefreshViewImage.clearAnimation();
                    mRefreshViewImage.startAnimation(mFlipAnimation);
                    mRefreshState = RELEASE_TO_REFRESH;
                } else if (mRefreshView.getBottom() < mRefreshViewHeight + 20
                        && mRefreshState != PULL_TO_REFRESH) {
                    mRefreshViewText.setText(R.string.pull_to_refresh_pull_label);
                    if (mRefreshState != TAP_TO_REFRESH) {
                        mRefreshViewImage.clearAnimation();
                        mRefreshViewImage.startAnimation(mReverseFlipAnimation);
                    }
                    mRefreshState = PULL_TO_REFRESH;
                }
            } else {
                mRefreshViewImage.setVisibility(View.GONE);
                resetHeader();
            }
        } else if (mCurrentScrollState == SCROLL_STATE_FLING
                && firstVisibleItem == 0
                && mRefreshState != REFRESHING) {
            setSelection(1);
        }

        if (mOnScrollListener != null) {
            mOnScrollListener.onScroll(view, firstVisibleItem,
                    visibleItemCount, totalItemCount);
        }
    }

    @Override
    public void onScrollStateChanged(AbsListView view, int scrollState) {
        mCurrentScrollState = scrollState;

        if (mOnScrollListener != null) {
            mOnScrollListener.onScrollStateChanged(view, scrollState);
        }
    }

    public void prepareForRefresh() {
        resetHeaderPadding();

        mRefreshViewImage.setVisibility(View.GONE);
        // We need this hack, otherwise it will keep the previous drawable.
        mRefreshViewImage.setImageDrawable(null);
        mRefreshViewProgress.setVisibility(View.VISIBLE);

        // Set refresh view text to the refreshing label
        mRefreshViewText.setText(R.string.pull_to_refresh_refreshing_label);

        mRefreshState = REFRESHING;
    }

    public void onRefresh() {
        Log.d(TAG, "onRefresh");

        if (mOnRefreshListener != null) {
            mOnRefreshListener.onRefresh();
        }
    }

    /**
     * Resets the list to a normal state after a refresh.
     * @param lastUpdated Last updated at.
     */
    public void onRefreshComplete(CharSequence lastUpdated) {
        setLastUpdated(lastUpdated);
        onRefreshComplete();
    }

    /**
     * Resets the list to a normal state after a refresh.
     */
    public void onRefreshComplete() {        
        Log.d(TAG, "onRefreshComplete");

        resetHeader();

        // If refresh view is visible when loading completes, scroll down to
        // the next item.
        if (mRefreshView.getBottom() > 0) {
            invalidateViews();
            setSelection(1);
        }
    }

    /**
     * Invoked when the refresh view is clicked on. This is mainly used when
     * there's only a few items in the list and it's not possible to drag the
     * list.
     */
    private class OnClickRefreshListener implements OnClickListener {

        @Override
        public void onClick(View v) {
            if (mRefreshState != REFRESHING) {
                prepareForRefresh();
                onRefresh();
            }
        }

    }

    /**
     * Interface definition for a callback to be invoked when list should be
     * refreshed.
     */
    public interface OnRefreshListener {
        /**
         * Called when the list should be refreshed.
         * <p>
         * A call to {@link PullToRefreshListView #onRefreshComplete()} is
         * expected to indicate that the refresh has completed.
         */
        public void onRefresh();
    }
}
